VPN Failover Configuration

Hi there,

Kindly help on how to configure a scenario that requires a VPN to failover to another VPN connection if the primary link is down. Here's the case, we have two router, Router A on the HQ and Router B on the the branch site. Both of the routers A and B has Dual ISP or multi-homed. I need to configure the two routers with both their ISP's to be used for VPN tunnel. VPN tunnels were destined to the same network on the private side of each of the router. The setup will be Router A's link 1 connected to Router B's link 1 and Router A's link 2 connected to Router B's link 2 via VPN and vice versa. This must be done to achieved a redundant VPN connection that will auto failover in case a VPN link is down. Any sample config would be appreciated.

Table of Contents Introduction:This document describes details on how
NAT-T works. Background: ESP encrypts all critical information,
encapsulating the entire inner TCP/UDP datagram within an ESP header.
ESP is an IP protocol in the same sense that TCP an...
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